From a reader:

Hi Jonah,
Watch out how you wield that power, um-kay? Just one mention from you today and look what happened to George Nash’s book [The Conservative Intellectual Movement Since 1945] sales at Amazon:
Amazon.com Sales Rank:
Today: #17,442 in Books
Yesterday: #163,390 in Books
Impressive.

Me: While I choose to take absolute and full credit for this so as to further impress upon the free-book-sending publishing industry my enormous power, I should note that John Miller mentioned it the other day as well. Still, that merely underscores the awe-inspiring might of National Review Online.